FOAMED THERMAL INSULATING MATERIAL AND INSULATED STRUCTURE

Abstract: The insulated structure is formed into the space between the plastic board (2) and metal plate (3) with a disposition of copper pipes (5) by injection of the foamed thermal-insulating material being created by foaming (4), wherein a non-halogenated organophosphorus compound having a molecular weight over 150 as an additive with an OH group as a functional group is mixed with the raw materials of the foamed thermal-insulating material being comprised of polyol, a foam stabilizer, a catalyst, a foaming agent having at least one component of hydrocarbon, and an organic polyisocyanates. By adding a non-halogenated organophosphorus compound which has a molecular weight over 150 as an additive with an OH group as a functional group, the burning rate becomes the same as that of the present CFC11 foaming agent; in addition, the possibilities of phosphor corrosion by free ionization to the copper pipes (5) which are disposed inside of the insulated structure are eliminated and phosphorus transfer to the plastic board (2) and worries of food contamination are also eliminated.

Description: 1. Field of the Invention The present invention relates to the foamed thermal-insulating material being used for insulated structure such as refrigerators and freezers filled up with the foamed thermal-insulating material. 2. Background of Art Recently, environmental issues such as the destruction of the ozone layers and global warming, which are influenced by Chloro Fluoro Carbon (CFC), are getting closer attention. For this reason, reduction of the use of CFC as a foaming agent has become a very important issue. Therefore, since the hard urethane foam is the leading foamed thermal-insulating material, it is proposed to use a hydrocarbon foaming agent which does not include a halogen molecule. However, a hydrocarbon is not easily applied as a foaming agent because of combustibility safety and so on and thermal-insulating efficiency quality and so on, using a hydrocarbon as a foaming agent is less effective than the use of the foamed thermal-insulating material made by the present CFC11 foaming agent. WO-90/12841, EP-A-0551636, DE-A-4026893, EP-A-0364854 and GB-A-1536778 describe phosphorus-containing polyurethanes. 3. Description of Invention Concerning the above mentioned problem, the invention defined in the claims aims to provide the foamed thermal-insulating material and the insulated structure filled up with the foamed thermal-insulating material that are not inferior to the present foamed thermal-insulating material made by CFC11 foaming agent in terms of combustibility safety and so on and thermal-insulating efficiency quality and so on when a hydrocarbon is applied as a foaming agent. To achieve the above mentioned goal, this invention as defined in the claims aims to restrain combustibility of the foamed thermal-insulating material and to prevent the release of halides, which is a cause of acid rain, by adding a non-halogenated organophosphorus compound as an additive to the raw materials of the foamed thermal-insulating material including a hydrocarbon foaming agent such as pentane and cyclopentane The non-halogenated organophosphorus compound that may have a molecular weight over 150 and an OH group as a functional group, is polymerized with an organic polyisocyanates in order to eliminate the possibilities of phosphor corrosion by free ionization to the metal pipes which are disposed inside of the insulated structure and to eliminate worries of food contamination by phosphorus transfer through the plastic board. The organic polyisocyanates that have been polymerized by the use of the non-halogenated organophosphorus compound with active hydrogen are used as raw material of the foamed thermal-insulating material which includes a hydrocarbon such as pentane and cyclopentane as a foaming agent, in order to restrain combustibility of the foamed thermal-insulating material without the release of halides, which is a cause of acid rain by the burning of the foamed material for disposal purposes; to eliminate the possibilities of phosphor corrosion by free ionization to the metal pipes which are disposed inside of the insulated structure; and to eliminate worries of the contamination of food, which is preserved long term, by phosphorus transfer through the plastic board despite retaining a phosphor component in the urethane resin. The polyol component, that may include at least 5% or more of a polyether-polyol which is obtained from the addition polymerization of ethylenediamine and alkylene-oxide with a hydroxyl value of 350-650mg KOH/g, is used as raw materials for the foamed thermal-insulating material which includes a hydrocarbon such as pentane and cyclopentane as a foaming agent in order to maintain the quality of the foamed thermal-insulating material by having a foaming agent equally soluble to raw material components and by improving mutual solubility between a polyol component and a hydrocarbon foaming agent and also in order to improve an insulating efficiency of the foamed thermal-insulating material by raising the addition ratio of a hydrocarbon foaming agent to lower amounts of a co-foaming agent such as water and by lowering the ratio of carbonic acid gas which has higher gaseous thermal conductivity among other gas components being retained in the bubbles of the foamed thermal-insulating material. An antioxidant catalyst may be used as a catalyst for the raw materials of the foamed thermal-insulating material which includes a hydrocarbon such as pentane and cyclopentane as a foaming agent. This catalyst is used in order to achieve a low-density foam and to increase foaming efficiency by sharply lowering catalytic activation from the beginning to the middle stages of the reaction and by raising temperature of pre-mixed raw materials from 5 to 10 degrees C. At this point, due to the use of an antioxidant catalyst, the foamed thermal-insulating material has a good reaction balance since catalytic activation from the beginning to the middle stages of the reaction is distinctly lowered and the cream time and the gel time are not going to be extremely shortened in spite of raised temperature of the raw materials. Also, the problem of filling the cabinets up with foam is eliminated because the foam viscosity is.lowered and the uprising-process of foam viscosity is moderated by lowering catalytic activation in the early stage of reaction to make more foam available. In addition, a large amount of catalyst is not needed and a usual prescription of additive is maintained; therefore, there are no filling problems such as cure and adhesive foams, and a foamed thermal-insulating material with high quality is obtained. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a sectional view in perspective of the insulated structure according to the illustrated operation of the invention; and Figure 2 is a cross-sectional view of the insulated structure according to the illustrated operation of the invention. BEST MODE FOR CARRYING OUT THE INVENTION The following text, referring to Figure 1 and 2, is an explanation of illustrated operation of the invention. The insulated structure (1) is formed into the space between the plastic board such as ABS (2) and metal plate (3) by injection of the foamed thermal-insulating material being created by foaming which is made of hard urethane foam (4). The copper pipes (5), which have circulating refrigerant, are disposed in the foamed thermal-insulating material (4). Table 1 indicates a prescribed combination ratio of the raw materials of the foamed thermal-insulating material (4) for the illustrated operation 1 (not according to the present invention) and illustrated comparisons 1 2, and 3. Illustrated Operation 1 Illustrated Comparison 1 Illustrated Comparison 2 Illustrated Comparison 3 Prescribed raw materials and Combination weight ratio Polyol 100 100 100 100 Foam Stabilizer 3 3 3 3 Catalyst 2 2 2 2 Foaming Agent A 15 15 15 0 Foaming Agent B 1 1 1 1 Foaming Agent C 0 0 0 32 Additive A 8 0 0 0 Additive B 0 0 5 0 Isocyanate Component 135 135 135 135 Analyzed Outcome Burning Time (second) 75 40 85 70 Corrosion of the Copper Pipes no corrosion no corrosion corrosion no corrosion Phosphorus Transfer through Plastic Board no transfer no transfer transfer no transfer Referring to Table 1: 1) polyol is an aromatic amine polyether-polyol with a hydroxyl value of 460mg KOH/g 2) the foam stabilizer (the surfactant agent) is a silicon surface active agent F-335 from Shinetsu Kagaku Kogyo Kabushiki Gaisha 3) the catalyst is Kaoraizer No. 1 from Kao Company 4) the foaming agent A is cyclopentane 5) the foaming agent B is pure water 6) the foaming agent C is CFC11 7) the additive A is a phosphorus organic compound having dibutyl-hydroxymethylphosphonate 8) the additive B is tris (2-chlorethyl) phosphate which includes a halogen 9) the isocyanate component is an organic polyisocyanates having a crude MDI with amine equivalent 135 In the illustrated operation 1 (not according to the present invention), each raw material such as polyol, a foam stabilizer, a catalyst, the foaming agent A, the foaming agent B, and the additive A, is mixed according to a prescribed combination ratio and is compounded as a pre-mix component. Then, the insulated structure (I) is formed into the space between the plastic board (2) and metal plate (3) with a disposition of copper pipes (5) by injection of this compounded pre-mix component and an isocyanate component, which are mixed by a prescribed combination ratio and are foamed in a high-pressure foaming machine. In the illustrated comparison 1, each raw material such as polyol, a foam stabilizer, a catalyst, the foaming agent A, and the foaming agent B, is mixed according to a prescribed combination ratio and is compounded as a pre-mix component. Then, the insulated structure (1) is formed into the space between the plastic board (2) and metal plate (3) with a disposition of copper pipes (5) by injection of this compounded pre-mix component and an isocyanate component, which are mixed by a prescribed combination ratio and are foamed in a high-pressure foaming machine. In the illustrated comparison 2, each raw material such as polyol, a foam stabilizer, a catalyst, the foaming agent A, the foaming agent B, and the additive B, is mixed according to a prescribed combination ratio and is compounded as a pre-mix component. Then, the insulated structure (1) is formed into the space between the plastic board (2) and metal plate (3) with a disposition of copper pipes (5) by injection of this compounded pre-mix component and an isocyanate component, which are mixed by a prescribed combination ratio and are foamed in a high-pressure foaming machine. In the illustrated comparison 3, each raw material such as polyol, a foam stabilizer, a catalyst, the foaming agent B, and the foaming agent C, is mixed according to a prescribed combination ratio and is compounded as a pre-mix component. Then, the insulated structure (1) is formed into the space between the plastic board (2) and metal plate (3) with a disposition of copper pipes (5) by injection of this compounded pre-mix component and an isocyanate component, which are mixed by a prescribed combination ratio and are foamed in a high-pressure foaming machine. The illustrated comparison 1 uses no additives; the illustrated comparison 2 added tris (2-chlorethyl) phosphate including a halogen as an additive; and the illustrated comparison 3 uses CFC11 as a foaming agent. A degree of combustibility for each foamed thermal-insulating material (4) is shown in Table 1 as a specificity value which is a burning time listed in a combustibility test item of JIS-A9514. The analyzed outcome, which indicates corrosion for the copper pipes (5) and phosphorus transfer through the plastic board (2) when the insulated structure (1) has been operated for 3 months under the condition of 40oC and 95%RH; is also shown in Table 1. As clearly shown in evaluated results of Table 1, the combustibility for the resin part of the foamed thermal-insulating material (4) is restrained when dibutyl-hydroxymethyl-phosphonate (the non-halogenated organophosphorus compound which has a molecular weight over 224 as an additive with an OH group as a functional group) is used and the degree of combustibility becomes almost same as that of CFC11 foaming agent even if the hydrocarbon cyclopentane which is combustible is used as a foaming agent. As a result, it eliminates the risk of fire or spread of fire; it contributes to the solution of global environmental issues such as the destruction of the ozone layers; moreover, it makes the product available to be safely used. In addition, phosphor corrosion by free ionization to the copper pipes (5) is eliminated since dibutyl-hydroxymethyl-phosphonate, which has a molecular weight over 224 with an OH group as a functional group, is reacted and polymerized to an organic polyisocyanates. Even under the high humidity conditions, where the moisture penetration from outside attaches to the copper pipes to cause phosphor corrosion, there aren't any corrosion problems. In other words, to restrain a free ionization of phosphor due to the polymerization enhances the product reliability for long term use. Further more, it concludes that there is no phosphorus transfer through the plastic board (2) and no worries of the contamination of food, which can be preserved long term. In other hand, the illustrated comparison 1 which uses no additives is not suitable because of the increase of the combustibility speed when it is compared to the illustrated comparison 3 which uses CFC 11. Also, the illustrated comparison 2 which added tris (2-chlorethyl) phosphate including a halogen as an additive is not suitable because of the corrosion of the copper pipes (5) and the phosphorus transfer through the plastic board (2). The following is an explanation to the illustrated operation 2 of the invention. Table 2 indicates a prescribed combination ratio of the raw materials of the foamed thermal-insulating material (4) for the illustrated operation 2 and illustrated comparisons 4, 5, and 6. Illustrated Operation 2 Illustrated Comparison 4 Illustrated Comparison 5 Illustrated Comparison 6 Prescribed raw materials and Combination weight ratio Polyol 100 100 100 100 Foam Stabilizer 3 3 3 3 Catalyst 2 2 2 2 Foaming Agent A 15 15 15 0 Foaming Agent B 1 1 1 1 Foaming Agent C 0 0 0 32 Isocyanate Component A 148 0 0 0 Isocyanate Component B 0 135 0 135 Isocyanate Component C 0 0 143 0 Analyzed Outcome Burning Time (second) 75 40 85 70 Corrosion of the Copper Pipes no corrosion no corrosion corrosion no corrosion Phosphorus Transfer through Plastic Board no transfer no transfer transfer no transfer Referring to Table 2: 1) polyol is aromatic amine polyether-polyol with a hydroxyl value of 460mg KOH/g 2) the foam stabilizer is a silicon surface active agent F-335 from Shinetsu Kagaku Kogyo Kabushiki Gaisha 3) the catalyst is Kaoraizer No. 1 from Kao Company 4) the foaming agent A is cyclopentane 5) the foaming agent B is pure water 6) the foaming agent C is CFC11 7) the isocyanate component A is an organic polyisocyanates having a crude MDI with amine equivalent 135, which is previously polymerized with combination ratio 5% of a phosphorus organic compound having dibutyl-hydroxymethyl-phosphonate with a molecular weight 224 and a hydroxyl value of 250mg KOH/g 8) the isocyanate component B is an organic polyisocyanates having a crude MDI 9) the isocyanate component C is an organic polyisocyanates having combination ratio 5% of tris (2-chlorethyl) phosphate including a halogen In the illustrated operation 2, each raw material such as polyol, a foam stabilizer, a catalyst, the foaming agent A, and the foaming agent B, is mixed according to a prescribed combination ratio and is compounded as a pre-mix component. Then, the insulated structure (1) is formed into the space between the plastic board (2) and metal plate (3) with a disposition of copper pipes (5) by injection of this compounded pre-mix component and an isocyanate component A, which are mixed by a prescribed combination ratio and are foamed in a high-pressure foaming machine. In the illustrated comparison 4, each raw material such as polyol, a foam stabilizer, a catalyst, the foaming agent A, and the foaming agent B, is mixed according to a prescribed combination ratio and is compounded as a pre-mix component. Then, the insulated structure (1) is formed into the space between the plastic board (2) and metal plate (3) with a disposition of copper pipes (5) by injection of this compounded pre-mix component and an isocyanate component B, which are mixed by a prescribed combination ratio and are foamed in a high-pressure foaming machine. In the illustrated comparison 5, each raw material such as polyol, a foam stabilizer, a catalyst, the foaming agent A, and the foaming agent B, is mixed according to a prescribed combination ratio and is compounded as a pre-mix component. Then, the insulated structure (1) is formed into the space between the plastic board (2) and metal plate (3) with a disposition of copper pipes (5) by injection of this compounded pre-mix component and an isocyanate component C, which are mixed by a prescribed combination ratio and are foamed in a high-pressure foaming machine. In the illustrated comparison 6, each raw material such as polyol, a foam stabilizer, a catalyst, the foaming agent B, and the foaming agent C, is mixed according to a prescribed combination ratio and is compounded as a pre-mix component. Then, the insulated structure (1) is formed into the space between the plastic board (2) and metal plate (3) with a disposition of copper pipes (5) by injection of this compounded pre-mix component and an isocyanate component B, which are mixed by a prescribed combination ratio and are foamed in a high-pressure foaming machine. The illustrated comparison 4 uses the isocyanate component B instead of the isocyanate component A; the illustrated comparison 5 uses the isocyanate component C instead of the isocyanate component A; the illustrated comparison 6 uses CFC11 as a foaming agent and the isocyanate component B instead of the isocyanate component A. A degree of combustibility for each foamed thermal-insulating material (4) is shown in Table 2 as a specificity value which is a burning time listed in a combustibility test item of JIS-A9514. The analyzed outcome, which indicates corrosion for the copper pipes (5) and phosphorus transfer through the plastic board (2) when the insulated structure (1) has been operated for 3 months under the condition of 40oC and 95%RH; is also shown in Table 2. As clearly shown in evaluated results of Table 2, the combustibility for the resin part of the foamed thermal-insulating material (4) is restrained when an organic polyisocyanates with a crude MDI which has been polymerized by dibutyl-hydroxymethyl-phosphonates (the non-halogenated organophosphorus compound which has a molecular weight over 224 as an additive with active hydrogen) is used and the degree of combustibility becomes almost same as that of CFC11 foaming agent even if the hydrocarbon cyclopentane which is combustible is used as a foaming agent. As a result, it eliminates the risk of fire or spread of fire; it contributes to the solution of global environmental issues such as the destruction of the ozone layers; moreover, it makes the product available to be safely used. In addition, phosphor corrosion by free ionization to the copper pipes (5) is eliminated since dibutyl-hydroxymethyl-phosphonate is previously reacted and polymerized to an organic polyisocyanates. Even under the high humidity conditions, where the moisture penetration from outside attaches to the copper pipes to cause phosphor corrosion, there aren't any corrosion problems. In other words, to restrain a free ionization of phosphor due to the pre-polymerization to an organic polyisocyanates enhances the product reliability for long term use. Further more, it concludes that there is no phosphorus transfer through the plastic board (2) and no worries of the contamination of food, which can be preserved long term. On the other hand, the illustrated comparison 4 which uses an organic polyisocyanates having a crud MDI is not suitable because of the increase of the combustibility speed when it is compared to the illustrated comparison 6 which uses CFC 11. Also, the illustrated comparison 5 which uses an organic polyisocyanates being added tris (2-chlorethyl) phosphate including a halogen, as an isocyanate component having a crude MDI is not suitable because of the corrosion of the copper pipes (5) and the phosphorus transfer through the plastic board (2). The following is an explanation to the illustrated operation 3 not according to the invention. Table 3 indicates a prescribed combination ratio of the raw materials of the foamed thermal-insulating material (4) for the illustrated operation 3 and illustrated comparisons 7 and 8. Illustrated Operation 3 Illustrated Comparison 7 Illustrated Comparison 8 Prescribed raw materials and Combination weight ratio Polyol A 20 0 0 Polyol B 80 100 100 Foam Stabilizer 1.5 1.5 1.5 Catalyst 2 2 2 Foaming Agent A 28 28 18 Foaming Agent B 0.5 0.5 1.5 Isocyanate Component 127 127 133 Analyzed Outcome Thermal Conductivity (W/mK) 0.0185 0.0185 0.0195 Carbonic acid gas in the foam 50-60 50-60 70-80 Density (kg/cm2) Maximum 36 40 * 1 36 Minimum 35 32 *2 35 Filling up foam level to insulated box structure good *1 leak * 2 unfilled good Referring to Table 3: 1) polyol A is a polyether-polyol which is obtained from the addition polymerization of ethylenediamine and propylene-oxide with a hydroxyl value of 400mg KOH/g 2) polyol B is an aromatic amine polyether-polyol with a hydroxyl value of 460mg KOH/g 3) the foam stabilizer is a silicon surface active agent F-335 from Shinetsu Kagaku Kogyo Kabushiki Gaisha 4) the catalyst is Kaoraizer No. 1 from Kao Company 5) the foaming agent A is n-pentane 6) the foaming agent B is pure water 7) the isocyanate component is an organic polyisocyanates having a crude MDI with amine equivalent 135 In the illustrated operation 3 (not according to the present invention) each raw material such as polyol A, polyol B, a foam stabilizer, a catalyst, the foaming agent A, and the foaming agent B is mixed according to a prescribed combination ratio and is compounded as a pre-mix component. Then, the insulated box structure is formed by injection of this compounded pre-mix component and an isocyanate component, which are mixed by a prescribed combination ratio and are foamed in a high-pressure foaming machine, into the space between ABS material inside the box and metal plate outside the box. In the illustrated comparison 7, each raw material such as polyol B, a foam stabilizer, a catalyst, the foaming agent A, and the foaming agent B, is mixed according to a prescribed combination ratio and is compounded as a pre-mix component. Then, the insulated box structure is formed into the space between ABS material inside the box and metal plate outside the box by injection of this compounded pre-mix component and an isocyanate component, which are mixed by a prescribed combination ratio and are foamed in a high-pressure foaming machine. In the illustrated comparison 8, each raw material such as polyol B, a foam stabilizer, a catalyst, the foaming agent A, and the foaming agent B, is mixed according to a prescribed combination ratio and is compounded as a pre-mix component. Then, the insulated box structure is formed into the space between ABS material inside the box and metal plate outside the box by injection of this compounded pre-mix component and an isocyanate component, which are mixed by a prescribed combination ratio and are foamed in a high-pressure foaming machine. The illustrated comparison 7 didn't use ethylenediamine polyether as polyol; the illustrated comparison 8 didn't use ethylenediamine polyether as polyol, but increased pure water as a co-foaming agent. Distinctive outcomes of the illustrated operation 3, the illustrated comparison 7 and 8 for the thermal conductivity and the density of the thermal-insulating material are shown in Table 3. As clearly shown in evaluated results of Table 3, the density quality for the foamed thermal-insulating material of the illustrated operation 3 being foamed in a high-pressure foaming machine is maintained at a proper level when n-pentane, which has a poor mutual solubility, is used as a foaming agent. Therefore, the insulated box structure with the foamed thermal-insulating material (the illustrated operation 3) produces the same excellent quality as the present CFC11 foaming agent which is a halogenated hydrocarbon foaming agent. Polyether-polyol, which is obtained from the addition polymerization of ethylenediamine and alkylene-oxide being added as a part of polyol components, and which has a good mutual solubility to a hydrocarbon foaming agent, is equally soluble in the raw material components. Therefore, the problem such as separation of a hydrocarbon foaming agent in the material tank of a high-pressure foaming machine is eliminated; also, the foamed thermal-insulating material with a proper quality level is obtained by raising the addition ratio of a hydrocarbon foaming agent to lower the amount of co-foaming agent such as water which lowers the amount of carbonic acid gas which has higher gaseous thermal conductivity among other gas components being retained in the bubbles of the foamed thermal-insulating material. As a result of the foamed thermal-insulating material in the illustrated operation 3, it contributes to the solution of global environmental issues such as the destruction of the ozone layers by using a hydrocarbon foaming agent which has zero coefficient in the destruction of the ozone layers; moreover, it also contributes to improve the quality and to save energy by having the same excellent insulating efficiency as that of the present halogenated hydrocarbon foaming agent. In addition, the insulated structure being filled up with the foamed thermal-insulating material maintains a proper quality level during the production process and provides an excellent quality in the insulated box structure without losing the insulating efficiency which the present halogenated hydrocarbon foaming agent has. As it is shown in the illustrated comparison 7, when the same amount of a hydrocarbon foaming agent as the illustrated operation 3 without a polyether of ethylenediamine being added, the density of the thermal-insulating material being foamed in a high-pressure foaming machine is not maintained and problems such as a leak and unfilled parts of the foamed thermal-insulating material in the insulated box structure occurred. Also, as it is shown in the illustrated comparison 8, when water as a co-foaming agent is increased, there isn't enough improvement of an insulating efficiency due to the raise for the amount of carbonic acid gas in the bubbles . The following is an explanation to the illustrated operations 4-7 not according to the invention. Table 4 indicates a prescribed combination ratio of the raw materials of the foamed thermal-insulating material (4) for the illustrated operations 4-7 and illustrated comparisons 9-12. Illustrated Operation Illustrated Comparison 4 5 6 7 9 10 11 12 Prescribed raw materials and Combination weight ratio Polyol 100 100 100 100 100 100 100 100 Foaming Stabilizer 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 Catalyst No. 31 1.5 1.0 - - 2.2 2.2 1.7 1.7 Catalyst No. 55 1.5 2.0 3.0 3.0 - - - 0.5 Water 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 Cyclopentane 18 18 18 18 18 18 18 18 Isocyanate 148 148 148 148 148 148 148 148 Pre-mix Temperature (oC) 27 27 27 32 22 27 27 27 Reactivity (GT) (second) 30 32 35 30 30 25 30 28 Free Density (Kg/m3) 27.0 27.0 27.0 26.3 28.5 27.0 27.0 27.0 Quality of the Insulated box structure Expansion of insulated box (%) 2.0 2.0 2.0 2.0 3.0 3.0 7.0 4.0 Peel-off of board after cold thermal cycles no no no no no no yes no Filling up foam level to insulated box good good good good good poor good good Referring to Table 4: 1) polyol is a compound of aromatic amine polyether-polyol and polyether-polyol of ethylenediamine with a total hydroxyl value of 460mg KOH/g 2) the foam stabilizer is a silicon surface active agent F-335 from Shinetsu Kagaku Kogyo Kabushiki Gaisha 3) the catalysts are Kaoraizer No. 31 and No. 55 from Kao Company 4) the foaming agent is cvclopentane Each raw material is mixed according to a prescribed combination ratio and is compounded as a pre-mix component. In addition, the isocyanate component is an organic polyisocyanates having a polymeric MDI with amine equivalent 135. The insulated box structure is formed by injection of this compounded pre-mix component and an isocyanate component, which are mixed by a prescribed combination ratio and are foamed in a high-pressure foaming machine, into the space between ABS material inside the box and metal plate outside the box. The pre-mix component, which is mixed with a foaming agent, polyether-polyol, and mixed material as a helping agent, is formed by using a static mixer. Four test measurements in Table 4 are as follows (the illustrated operations 4-7 are not according to the invention): 1) the free density of the urethane foam which is foamed according to prescribed urethane raw material data in Table 4; 2) the filling foam level in the insulated box structure which is foamed at the said free density aiming for a core density of 34kg/cm2; 3) the expansion of the insulated box structure which measures the degree of cure foams at the time of the operation; and 4) the peeling off the board after thermal and cold cycles which is the peeling off of urethane foam from ABS board inside the box and metal board outside the box after the said insulated box structure has been operated in 5 cold and thermal cycles of 30°C for 12 hours and 60°C for 12 hours. Each result such as the case without an increase of raw material temperature, the case without applying Kaoraizer No. 55 which is an antioxidant catalyst, and the case using Kaoraizer No. 55 with under 50% by weight of a catalyst component, is shown in Table 4 as the illustrated comparisons 9-12. As is clearly shown in the quality of the insulated box structure of Table 4, when Kaoraizer No. 55 with under 50% by weight of a catalyst component is applied, the problems of filling up foam and reactivity are eliminated even when a low-density foam is set and a temperature of pre-mixed raw materials is raised from 5 to 10 degrees cent, because an antioxidant catalyst, which is comprised of both a tertiary amine polymer and second tertiary amine polymer with over 50 % by weight of a catalyst component being partially or entirely neutralized by carboxylic acid, is used as a catalyst component. Therefore, when cyclopentane is used as a foaming agent, to lower the foam density becomes possible by raising the temperature of the raw materials without a large change of a present prescription instead of developing new mutual soluble raw materials. When an antioxidant catalyst, which is comprised of both a tertiary amine polymer and second tertiary amine polymer with under 50 % by weight of a catalyst component being partially or entirely neutralized by carboxylic acid, is used as a catalyst component, there are problems of worse cure and adhesive foams since the adjustment of reactivity becomes necessary due to a decrease of catalyst amount. Also, early reactivity occurs and the filling foam level in the insulated box structure becomes worse without the adjustment of reactivity. As a result, cyclopentane (one of a hydrocarbon being used as a urethane foaming agent), which helps to solve global environmental issues because of its zero coefficient to the destruction of the ozone layers and of its small influences to the global warming, is used without a large prescription change in order to provide the high quality foamed thermal-insulating material which has many kinds of foam characteristics presently being used and also the high quality insulated box structure in which the said foamed thermal-insulating material is filled by injection. Possible production use As explained, the foamed thermal-insulating material and the insulated structure filled up with the foamed thermal-insulating material in this invention are not inferior to the present foamed thermal-insulating material made by CFC11 foaming agent in terms of combustibility safety and so on and thermal-insulating efficiency quality and so on when a hydrocarbon is applied as an urethane foaming agent, which helps to solve global environmental issues because of its zero coefficient as to the destruction of the ozone layers and of its negligible influence on global warming. EXPLANATION OF SIGNS IN THE FIGURES (1) the insulated structure (2) the plastic board (3) the metal plate (4) the foamed thermal-insulating material (5) the copper pipes

Claims: A foamed thermal-insulating material obtained by foaming a polyol, a foam stabilizer, a catalyst, a foaming agent comprising a hydrocarbon, and organic polyisocyanates, wherein such organic polyisocyanates are previously polymerized by the use of a non-halogenated organophosphorus compound having an active hydrogen. The foamed thermal-insulating material according to claim 1, wherein said non-halogenated organophosphorus compound has a molecular weight over 150 and an OH-group as a functional group. The foamed thermal-insulating material according to claim 1 or 2, wherein said non-halogenated organophosphorus compound has a molecular weight under 400. The foamed thermal-insulating material according to one of the claims 1-3, wherein said polyol comprises at least 5 % or more of a polyether-polyol, which is obtained from the addition polymerization of ethylenediamine and alkylene oxide, with a hydroxyl value of 350-650 mg KOH/g. The foamed thermal-insulating material according to one of the claims 1-4, wherein said catalyst is a catalyst composition comprised of a tertiary amine polymer and a second tertiary amine polymer with over 50 % by weight being partially or entirely neutralized by carboxylic acid. The foamed thermal-insulating material according to one of the claims 1-5, wherein said hydrocarbon is pentane. The foamed thermal-insulating material according to one of the claims 1-5, wherein said hydrocarbon is cyclopentane. Use of the foamed thermal-insulating material according to one of the claims 1-7 for shaping an insulated structure by injecting said foamed thermal-insulating material into the space between a plastic board and a metal plate.

Inventors: NAKAMOTO HIDEO, TENRA TOMOHISA, TSUDA YOSHIYUKI, UEKADO KAZUTAKA, NAKAMOTO, HIDEO, TENRA, TOMOHISA, TSUDA, YOSHIYUKI, UEKADO, KAZUTAKA, NAKAMOTO, Hideo 16-16-1515, Nitaka 6-chome
Applicants: MATSUSHITA REFRIGERATION, MATSUSHITA REFRIGERATION COMPANY
Application year: 1994
Main classification: C08G18
IPC codes: C08G18, F25D23, F16L59, C08J9